Means for holding impression-plates upon heater-beds



c.-F. BURROUGHS. MEANS'FOR HOLDING IMPRESSION PLATES UPON HEATER BEDS.

APPLICAT ION FILE D IULY15, IQIQI I 1,346,76 Patented July 2%, 1920.

, l I I $3 M 3 ATTORNEY CHARLES Fl nunaoucns, or nas'r ORANGE, new JERSEY, ASSIGNO'B, TO coiurosrrion MACHINERY CORPORATION, or NEWARK, new JERSEY, A oonronarron' or new JERSEY.

MEANS'FOR HOLDING IMPBESSION-PLATES UPON HEATER-BED3.

Application filed July 15,

To all whom it may concern:

Be itoknown that 1, CHARLES F. BUR- nonor-rs, a citizen of the United States, residing at 122 Prospect street, East Orange, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Means for Holding Impression-Plates upon Heater-Beds, fully described and represented in the following specification and the accompanying draw-- ings, forming a part of the same.

This invention relates to means for secur ing a series of dies or impressionplates detachably upon av heater-bed so that when used in a press for molding plastic material, which requires the application of heat, the

-dies may be held upon a plane surface of the heater-bed and readily removed therefrom and other dies secured thereto.

In practising the invention, aholder for a series of'dies is formed of a flat plate, with a series of perforations adapted each to receive one of a series of dies, the dies being enlarged at one end and fitted to the perforations so that their bases all lie in the same plane and can thus be applied to a flat heater-bed without fitting the dies separately to the bed.

\Vith such construction. the dies are not fastened individually to the hcater-hedhut are held thereto in their working positions by fastening the holder to the said lied.

Such dies are commonly employed inconnection with counterparts or forces for compressing the material upon the die, and this invention enables a series of such dies and their counterparts to be mounted in --scparate holders in cractly corresponding positions, so as to fit accurately upon one another when used in a press.

The invention will be understood by reference to the annexed drawing, in which Figure 1 shows the under side of a dieholdcr; Fig. 2 is a section of the same on line 22 in Fig. 1; and Fig. 3 is a section. on line 3-3 in Fig. 1. y

Figs. 4, 5 and 6 are drawn upon a scale four times as great as the other figures.

Fig. 4 is a section of two dies adapted to mold a button with the adjacent parts of their holders; Fig. 5 is an edge view of the lower diejan l Fig. 6 is an edge view of a circular button molded in the said dies. Fig.

' Specification of Letters Patent.

Patented July 20. 1920.

Serial No. 310,994.

7 is an edge view of a heater-bed with a dieplate held detachably thereto by gibs.

a indicates the plane surface of a heaterbed 5, "and c designates a holder consisting of a flat plate having a series of circular perforations (Z. This view shows'the under side of the holder which is applied next/to the heater-bed, and a circular recess or rabbet f is shown in the nearer side of each of the perforations to receive a flange or collar 6 upon one end of the circular die g.

The holder-plate presses upon the flanges of all of the dies when secured upon the heater-bed and thus holds them firmly in place. Holes h are shown extended through the holder at various points to receive screws 73 having flat heads which are recessed into the plate flush with its surface.

The bodies of the screws are fitted to tapholes a in the heater-bed, and suchscrews serve to clamp the holder to the heater-bed, with all the dies in suitable positions upon such bed, to cooperate with a series of counterpart dies (7 held in a. similar holder upon the working face j of a suitable force.

With such construction the working face of the force can be flat like the face a of the heater-bed and the counterpart dies 9' held uponthe force by a holder similar to that shown upon the heater-bod.

Two holes 6' are shown in the holder of Fig. 1 for inserting steady-pins through the holder into the heater-lied or force to set the holder 0' with the dies in their working positions.

The die 9 is shown formed to shape the under side Z". of a button. and the counterpart die :0 has an impression adapted to form a huh I upon the rear side of the butin the holder c can be effected by securing the two holders together in the process of. manufacture by extcndingthe perforations (Z through the same. Such method obviously makes the perforations agree exactly in the two holders and insures the coincidence of the two sets of dies when the holders are properly adjusted upon the heater-bed and the force. x

The perforations 11 through the holder are preferably made circular as apertures of such shape are formed so readily and cheaply by a revolving drill or shaping tool; but the impression in the die may-be formed of any possible shape, and the exterior of the die of any convenient shape provided the perforations of the holder are adapted to receive such dies and to retain them in their working position upon the heater-bed. It will be understood that the perforations of the holder fit in contact with the diesupon all sides as they encircle the dies in contact with their larger ends.

A modification of the means for retaining tln die in the holder is shown in the lower part of Fig. 2 where the exterior of the die is shown tapered from the base to the front, and the perforation in the holder correspondingly tapered so that the die is held firmly in the holder when clamped upon the heater-bed.

The circles f drawn in Fig. 1 within the, perforations (Z may represent either the shouldered rabbet lettered f in Fig. l, or the taper of the perforation shown in Fig. 2.

i'uch taper of the die-body greatly facilitatesthe insertion of the dies in the perform tions of the holder, and where the die is formed with a collar the front end of the die is preferably tapered as shown at yfi.

Fig. 7 shows a modification of the means for securing the holder and series of dies upon the heater-bed I), which avoids the necessity of removing the screws ll when it is necessary to remove the dies.

. This modification consists of gibs "m, secured by screws upon the heater-bed near its opposite edges, and fitted to rabbets n in opposite edges of the holder-plate.

Screws a hold the gibs upon the heater- 'bed and when loosened permit the insertion or removal of the holder, and when tight-- ened grip its opposite edges so as to hold it in its working position. Such use of gibs is a common expedient and is not claimed herein.

A stop may be provided upon the heaterbed at any point to set the holder in its .working position, or steady-pins may be inserted through the holder into the bed, as described for the pins 6 in Fig. 4.

Twentyeight perforations b are shown in 'the holder in Fig. -1, and the invention is especially applicable for holding the large number of relatively small dies of the same shape and dimension, but the size and number of the dies is immaterialprovided the holder is formed with a plurality of perforations adapted to receive a series of dies and retain them upon the heater-bed, as described.

My invention permits the ready removal of dies from a press when the impressions therein are damaged or worn and it also permits dies having different impressions to be substituted in the same holder, or a different holder substituted to support dies of larger or smaller dimension.

It will be understood that the heater-bed is inserted in a suitable pressso as to operate the dies in molding the desired article, and such heater-bed may be heated in any desired manner. 5

It is common to make such heater-beds hollow, as shown in Fig. 3, and to circulate a heating fluid therein through an inlet b and an outlet shown in Fig. 7, but the heater-bed may-be heated by electric or other suitable means as the combination of such means is wholly immaterial to the present invention llaving thus set forth the nature of the i i' vention what is claimed herein is:

l. The combination, with a plurality of circular dieseach having a collar upon one end, of a holder having a, series of perforations recessed each in one end and adapted to receive the collars upon the dies and to Hold the dies in contact with a heater-bed.

i. In a means forsecnring a series ,of dies upon a heater-bed, thev combination, with a holder having a series of circular perforations of dies titted to the said perforations and tapered at one end to readily enter said perforations.

The combination. with a heater-bed having a plane surface, of a series of dies adapted to rest upon said surface and a holder having perforations adapted to receive the base of each die and provided with means for securing it upon the heater-bed,"

and a fort-e" having a plane surface, a series of counterpart dies adapted to sit upon sa id surface a holder having perforations adapted to receive such counterpart dies, and means for securing the said holder upon the fort-e" with the counterpart dies in register with the dies upon the heater-bed.

In testimony whereof I-have hereunto set my hand.

CHARLES F. BURROUGHS. 

